Numerical Simulation And Experimental Study On Leakage Effect Of Pipeline

Pipelines are widely used in the transportation of oil and natural gas in offshore engineering structures such as offshore mining platforms.Vibration effects often occur due to the internal fluid flow.Based on the numerical simulation and model experiment,the leakage effect introduced by the leaking hole of the flexible pipeline within a constant internal flow velocity is studied.The vibration problems of fixedly supported flow pipe caused by the leakage is studied.The research contents are as follows: A pipeline leakage model is established and combine with the existing pipeline vibration model to establish a non-linear dynamic model of a fixedly supported pipeline placed vertically when leaking.The theoretical derivation of the model is completed.Galerkin method is used to discretize the model.Houbolt method is used to transform the differential equations into non-linear equations.Newton-Raphson method is used for numerical simulation.The curve of vibration displacement of the pipeline is calculated,and the vibration spectrum curve is analyzed.The effect of different leak locations and internal flow velocities on the vibration response of the pipe is analyzed.Model experiments are designed to discuss the effects of different internal flow velocities on the vibration effects of the pipeline.Compared with theoretical calculation results,verify the consistency of experiment and theoretical calculation results.It is found that the leakage effect can change the critical value,so that the deformation increases linearly with the increase of the flow velocity.It can also increase the amplitude of the deformation,and at the same time excite different modalities of the pipeline system,causing the vibration response of multiple frequencies.